(1) ‘lubricant’ means a preparation consisting of base fluids and additives;

(2) ‘basefluid’ means a lubricating fluid whose flow, ageing, lubricity and anti-wear properties, as well as its properties regarding contaminant suspension, have not been improved by the inclusion of additive(s);

(3) ‘substance’ means a chemical element and its compounds in the natural state or obtained by any production process, including any additive necessary to preserve the stability of the products and any impurity deriving from the process used, but excluding any solvent which may be separated without affecting the stability of the substance or changing its composition;

(4) ‘thickener’ means one or more substances in the base fluid used to thicken or modify the rheology of a lubricating fluid or grease;

(5) ‘main component’ means any substance accounting for more than 5 % by weight of the lubricant;

(6) ‘additive’ means a substance or mixture whose primary functions are the improvement of the flow, ageing, lubricity, anti-wear properties or of contaminant suspension;

(7) ‘grease’ means a solid to semi-solid mixture which consists of a ‘thickener’ and may include other ingredients imparting special properties in a liquid lubricant.